Valve packing - John Crane

Construction/Features
VPS
Valve Packing
Product Description
John Crane 5-Ring Valve Packing Sets are available in
Standard or Utility arrangements.
Standard Valve Packing:
John Crane offers a unique Valve Packing Set consisting
of a presized set of rings. The packing set contains five
squared rings, which will seal the majority of liquids
encountered in a refinery or petrochemical plant.
Utility Valve Packing:
John Crane Utility Valve Packing Sets incorporate ultrahigh
purity Crane-foil ® (flexible graphite) and ultrahigh purity
graphite yarns to ensure low contaminant levels.
Standard Valve Packing:
■ Two high density John Crane G58 graphite die-formed
rings form the top and bottom sealing rings. These rings
ensure compression of the middle sealing rings and will
prevent any packing extrusion. For pressures above 138
bar/2000 psi, G58I is recommended for the top and
bottom rings.
■ Three medium density Crane-foil die-formed rings
comprise the center sealing rings which are completely
contained between the end rings.
Utility Valve Packing:
■ Two ultrahigh purity N-1635G braided graphite yarn rings
form the top and bottom sealing rings. These rings
ensure compression of the middle sealing
rings and prevent extrusion. The material
complies with GE spec. NEDC-31735P.
■ Three N-267 ultrahigh purity Crane-foil
middle rings comprise the center sealing
rings which are completely contained
between the end rings. The material
complies with GE spec. NEDC-31735P.
Both packing designs can be either statically
loaded or live-loaded. John Crane provides
specifications for live-loading that include
spring configuration and gland bolt torque
requirements calculated for individual
valve services.
These packing sets provide maximum
performance whether installed in a new
valve or when repacking an installed valve.
■ Low emission performance
■ Fire Safe - Tested per specifications meeting
or exceeding API 607 requirements
(standard set)
■ Available in Cartridge-Pak for Valve OEMs
Crane-foil is a registered trademark of John Crane.
Performance Capabilities
■ Temperatures:
650˚C/1200˚F (non-oxidizing atmosphere)
455˚C/850˚F (oxidizing atmosphere)
■ Pressure:
Up to 415 bar g/6000 psig
■ pH Range:
0 to 14 (except strong oxidizers)
Industries Served
■ Chemical Processing
■ Food and Beverage
■ Pharmaceutical
■ Pulp and Paper
■ Power Generation
Valve Packing

Valve Packing
VPS
Valve Packing
Standard Valve Packing
End Rings
John Crane’s Style G58 rings are manufactured by using
a high purity flexible graphite yarn that is first braided
and then die-formed into high density end rings. The
Crane-foil flexible graphite yarn is reinforced with a high
strength, high temperature filament to provide maximum
strength for the end ring material. The high density rings
ensure proper compression of the middle sealing rings
while preventing any extrusion of the softer sealing rings.
Middle Rings
The middle rings are manufactured from John Crane’s
Style 267 Crane-foil flexible graphite tape which
contains a passive inhibitor. The flexible graphite
contains no binders and is chemically inert.
Utility Valve Packing
End Rings
John Crane’s Style N-1635G rings are manufactured by
using a high purity graphite continuous filament yarn
which is interlace braided. The end rings ensure proper
compression of the middle sealing rings, while preventing
any extrusion of the softer Style N-267 sealing rings. Style
N-1635G is designed for critical valve services and meets
the stringent specifications of the Power Industry as well
as MIL-Spec requirements.
Middle Rings
The middle rings are manufactured from John Crane’s
Style N-267 Crane-foil flexible graphite tape which
contains a passive inhibitor and has a minimum carbon
content of 99.5%. The flexible graphite contains no
binders or lubricants and is chemically inert.
John Crane
North America
Morton Grove, Illinois USA
Tel: 1-847-967-2400
Fax: 1-847-967-3513
1-800-647-2548
Europe, Middle East, Africa
Slough, UK
Tel: 44-1753-224000
Fax: 44-1753-224224
Material Specifications
Middle Rings (3) Style 267 Crane-foil
die-formed ring
Temperature: 535˚C/1000˚F
pH: 0-14
Braided End Rings (2) Style G58 (No PTFE)
Temperature: 535˚C/1000˚F
pH: 0-14
Spacer Carbon Graphite
Springs (Live-load) 17-7 PH Stainless Steel
Steam Material Specifications
Middle Rings (3) Style N267 Crane-foil
die-formed ring
Temperature: 535˚C/1000˚F
pH: 0-14
Braided End Rings (2) Style N1635G (No PTFE)
Temperature: 535˚C/1000˚F
pH: 0-14
Spacer Carbon Graphite
Springs (Live-load) 17-7 PH Stainless Steel
Latin America
São Paulo, Brazil
Tel: 55-11-3049-9900
Fax: 55-11-3849-8270
Asia Pacific
Singapore
Tel: 65-222-9161
Fax: 65-223-5035
For your nearest John Crane facility, please contact one of the locations above.
If the products featured will be used in a potentially dangerous and/or hazardous process, your John Crane representative should be consulted prior to their selection and
use. In the interest of continuous development, John Crane Companies reserve the right to alter designs and specifications without prior notice. It is dangerous to smoke
while handling products made from PTFE. Old and new PTFE products must not be incinerated.
©2000 John Crane Print 9/00 www.johncrane.com ISO Certified S-VPS